TWI404000B - Driver for use in flat panel display - Google Patents
Driver for use in flat panel display Download PDFInfo
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- TWI404000B TWI404000B TW094107597A TW94107597A TWI404000B TW I404000 B TWI404000 B TW I404000B TW 094107597 A TW094107597 A TW 094107597A TW 94107597 A TW94107597 A TW 94107597A TW I404000 B TWI404000 B TW I404000B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
Description
本發明係關於一種用於將影像資料輸出為平面板顯示器內之對應電流的驅動器,更特定言之,係關於一種有機電致發光(EL)裝置的OLED。The present invention relates to a driver for outputting image data as a corresponding current in a flat panel display, and more particularly to an OLED of an organic electroluminescence (EL) device.
一平面板顯示器中,發光度通常由層次及光度代表。光度意味著螢幕每單位面積的光強度,而層次意味著一組光度內的亮度程度,其根據被輸入到像素單位的一視訊資料加以顯示。In a flat panel display, luminosity is usually represented by gradation and luminosity. Luminosity means the intensity of light per unit area of the screen, while gradation means the degree of brightness within a set of luminosities, which is displayed based on a video material that is input to the pixel unit.
一有機電致發光(EL)為一自發光裝置,其發射度與一供應的電流量成比例地加以控制。因此,為控制有機EL顯示器的發光及層次,使用一電流鏡來控制一電流驅動器,並利用藉由調整輸出線路的切換間隔控制一平均電流量的方法來控制輸出至平面板顯示器之像素的一電流量。An organic electroluminescence (EL) is a self-luminous device whose degree of emittance is controlled in proportion to the amount of current supplied. Therefore, in order to control the illumination and level of the organic EL display, a current mirror is used to control a current driver, and one of the pixels output to the flat panel display is controlled by controlling the average current amount by adjusting the switching interval of the output line. Electricity flow.
圖1為使用一普通有機電致發光LED(OLED)的平面板顯示器之方塊圖。1 is a block diagram of a flat panel display using a conventional organic electroluminescent LED (OLED).
參考圖1,使用OLED的平面板顯示器包括顯示器面板,其具有配置在矩陣內的複數個單位像素xy,用於控制片段線之片段線控制器,以及用於控制共用線之共用線控制器。Referring to FIG. 1, a flat panel display using an OLED includes a display panel having a plurality of unit pixels xy disposed in a matrix, a segment line controller for controlling a segment line, and a common line controller for controlling a common line.
顯示器面板包括縱向配置的複數個片段線及橫向配置的複數個共用線。片段線與共用線的每個交叉點處配置一個單位像素xy。此處,片段線稱為源極線,共用線稱為掃描線。The display panel includes a plurality of segment lines arranged in a longitudinal direction and a plurality of common lines arranged in a lateral direction. One unit pixel xy is arranged at each intersection of the segment line and the common line. Here, the segment line is referred to as a source line, and the common line is referred to as a scan line.
將片段線與共用線的交叉點處形成的單位像素配置在矩陣內,一個單位像素xy由一個OLED與一個電容器組成。OLED之一節點及電容器之一節點與一片段線連接,OLED之其他節點及電容器之其他節點與一共用線連接。The unit pixel formed at the intersection of the segment line and the common line is arranged in a matrix, and one unit pixel xy is composed of one OLED and one capacitor. One node of the OLED and one node of the capacitor are connected to a segment line, and other nodes of the OLED and other nodes of the capacitor are connected to a common line.
若向共用線施加一預定電壓並透過片段線供應電流,則OLED會發出光。相應地,藉由選擇共用線然後供應對應於像素資料的電流,執行影像資料的輸出。If a predetermined voltage is applied to the common line and current is supplied through the segment line, the OLED emits light. Accordingly, the output of the image material is performed by selecting the common line and then supplying the current corresponding to the pixel material.
配置片段線控制器的平面板顯示器用之驅動器稱為源極驅動器。在有機EL裝置情況下,源極驅動器採用電流驅動器配置,其將與參考電流相同的電流(包含輸出影像資料)供應至每個片段線。與源極驅動器內片段線一對一對應的輸出電流驅動級稱為通道。The drive used to configure the slice line controller's flat panel display is called the source driver. In the case of an organic EL device, the source driver employs a current driver configuration that supplies the same current (including output image data) as the reference current to each segment line. The output current drive stage that corresponds one-to-one with the segment lines in the source driver is called a channel.
若採用高畫質顯示器,片段線及共用線的數量增加。對於僅發送切換信號的較長共用線,此問題可忽略。不過,對於發送像素資料的片段線,隨著片段線數量增加,像素資料難以發送至實際像素。If a high-quality display is used, the number of segment lines and shared lines increases. This problem is negligible for long shared lines that only send switching signals. However, for a segment line that transmits pixel data, as the number of segment lines increases, it is difficult for pixel data to be sent to the actual pixel.
當將對應相同資料的驅動輸出電流供應至片段線時,由於從參考電流來源至片段線的連接線的電阻差異,施加於通道的電流及電壓不同。When the drive output current corresponding to the same data is supplied to the segment line, the current and voltage applied to the channel are different due to the difference in resistance of the connection line from the reference current source to the segment line.
為解決此問題,建議一種減少一個參考電流產生器管理的通道數目之方法。即,一個參考電流產生器管理的通道數目可藉由在整個晶片內分配複數個參考電流產生器而減少。不過,此方法使晶片面積增加。因此,減小晶片面積需要同時利用另一改良方法折衷通道可驅動性。To solve this problem, a method of reducing the number of channels managed by a reference current generator is suggested. That is, the number of channels managed by one reference current generator can be reduced by distributing a plurality of reference current generators throughout the wafer. However, this method increases the wafer area. Therefore, reducing the wafer area requires the use of another improved method to compromise channel driveability.
同時,電流鏡可用於匹配個別通道之驅動電流。圖2顯示傳統電流鏡的一範例,其中將與參考電流相同的一電流供應至源極線通道。At the same time, a current mirror can be used to match the drive current of individual channels. 2 shows an example of a conventional current mirror in which a current of the same reference current is supplied to the source line channel.
電流鏡採用高電壓PMOS電晶體加以實施。此處,利用高於PMOS電晶體Mref11(置放在二極體連接參考電流來源處)之PMOS電晶體移除電流偏移。The current mirror is implemented using a high voltage PMOS transistor. Here, the current offset is removed using a PMOS transistor that is higher than the PMOS transistor Mref11 (placed at the source of the diode connection reference current).
然而,若在高光度/高層級模式中參考電流增加,參考電晶體Mref11之汲極與閘極間的電壓差異變得太大,以致閘極電壓(Vg1)降低。輸出電晶體Mn11之閘極電壓(Vg1)的下降導致輸出電晶體Mn11來源內的電壓下降,從而造成輸出電壓(Vout1)降低。即,若增加參考電流來增加輸出電流,輸出電壓會下降。因此,難以向LED供應足夠的功率。However, if the reference current increases in the high-luminance/high-level mode, the voltage difference between the drain and the gate of the reference transistor Mref11 becomes too large, so that the gate voltage (Vg1) is lowered. The drop in the gate voltage (Vg1) of the output transistor Mn11 causes a drop in the voltage within the source of the output transistor Mn11, causing the output voltage (Vout1) to decrease. That is, if the reference current is increased to increase the output current, the output voltage will drop. Therefore, it is difficult to supply sufficient power to the LEDs.
明確地說,由於參考電晶體Mref11為關於電壓具有低電流增量的高電壓電晶體,Vg1的電壓下降較大,但由於低電壓輸出電晶體的閘極-源極臨限電壓引起的電壓升高較小。Specifically, since the reference transistor Mref11 is a high voltage transistor having a low current increment with respect to voltage, the voltage drop of Vg1 is large, but the voltage rise due to the gate-source threshold voltage of the low voltage output transistor The height is small.
為解決此問題,本案申請人已建議一種平面板顯示器用之驅動器,其在本發明者申請的韓國專利申請案第2003-82601號中予以揭示。In order to solve this problem, the applicant of the present application has proposed a driver for a flat panel display, which is disclosed in Korean Patent Application No. 2003-82601 filed by the present applicant.
平面板顯示器用之驅動器藉由在複數個通道處映射由參考電流區塊產生的參考電流以驅動平面板顯示器。A flat panel display driver drives a flat panel display by mapping reference currents generated by reference current blocks at a plurality of channels.
參考圖3,平面板顯示器用之驅動器包括參考電流區塊110及複數個通道150。參考電流區塊110包括採用低電壓MOS電晶體配置的第一電流鏡130。參考電流來源112產生參考電流,第一電流鏡130接收藉由透過輸入端子映射參考電流而產生的第一映射電流。第一映射電流穿過第一電流鏡130。參考電流區域配置在參考電流區塊110內。採用高電壓MOS電晶體配置通道150。通道150包括第二電流鏡151,其輸出作為輸出信號的第二映射電流。此處,藉由映射第一映射電流產生第二映射電流。Referring to FIG. 3, the driver for the flat panel display includes a reference current block 110 and a plurality of channels 150. The reference current block 110 includes a first current mirror 130 that is configured with a low voltage MOS transistor. The reference current source 112 generates a reference current, and the first current mirror 130 receives a first mapping current generated by mapping a reference current through the input terminal. The first mapping current passes through the first current mirror 130. The reference current region is disposed within the reference current block 110. The channel 150 is configured using a high voltage MOS transistor. Channel 150 includes a second current mirror 151 that outputs a second mapping current as an output signal. Here, the second mapping current is generated by mapping the first mapping current.
依據上述發明,由於參考電流及驅動電流未直接映射,即使參考電流增加,輸出電壓也不會降低。同樣,第二電流鏡151中,用於映射操作的兩個高電壓電晶體Mph151及Mph152配置在輸出通道位置附近。因此,由於映射電晶體製程錯誤發生的失配可能性更小。此外,由於採用具有低製程錯誤的低電壓電晶體實施第一電流鏡130,電流偏移減小。According to the above invention, since the reference current and the drive current are not directly mapped, the output voltage does not decrease even if the reference current increases. Also, in the second current mirror 151, two high voltage transistors Mph151 and Mph152 for mapping operations are disposed near the output channel position. Therefore, the possibility of mismatch due to mapping transistor process errors is less likely. Furthermore, since the first current mirror 130 is implemented with a low voltage transistor having a low process error, the current offset is reduced.
儘管低電壓電晶體佔據一小面積並具有較低程序錯誤,但操作面積較小。因此,存在第一電流鏡可映射之參考電流的輸入範圍較為狹窄的問題。Although the low voltage transistor occupies a small area and has a low program error, the operating area is small. Therefore, there is a problem that the input range of the reference current that can be mapped by the first current mirror is narrow.
因此,本發明之目的係提供平面板顯示器用之驅動器,其能夠減小由於製程錯誤引起的電流偏移。Accordingly, it is an object of the present invention to provide a driver for a flat panel display that is capable of reducing current drift due to process errors.
本發明之另一目的係提供平面板顯示器用之驅動器,即使在高電流輸出模式中,其能夠向輸出級供應足夠電壓,即高亮度強度。Another object of the present invention is to provide a driver for a flat panel display that is capable of supplying a sufficient voltage, i.e., high luminance intensity, to the output stage even in a high current output mode.
本發明之另一目的係提供平面板顯示器用之驅動器,其中可應用廣泛的參考電流。Another object of the present invention is to provide a driver for a flat panel display in which a wide range of reference currents can be applied.
根據本發明之一方面提供一種平面板顯示器用之驅動器,其調適成藉由使用電流驅動片段線,該電流係藉由參考一參考電流來源輸出的參考電流而產生。驅動器包括:驅動區塊選擇器,其用於選擇依據關於參考電流之參考電流值啟動的參考電流驅動區塊;以及複數個參考電流驅動區塊,其用於向驅動片段線之部分傳輸參考電流值。According to one aspect of the invention, a driver for a flat panel display is provided that is adapted to drive a segment line by using a current that is generated by reference to a reference current output from a reference current source. The driver includes: a driving block selector for selecting a reference current driving block activated according to a reference current value with respect to a reference current; and a plurality of reference current driving blocks for transmitting a reference current to a portion of the driving segment line value.
較佳的係,參考電流驅動區塊包括第一電流鏡,其用於映射參考電流以產生映射電流,以及通道包括第二電流鏡,其用於映射該映射電流以產生輸出電流。Preferably, the reference current drive block includes a first current mirror for mapping the reference current to generate a map current, and the channel includes a second current mirror for mapping the map current to generate an output current.
以下將參考附圖詳細說明本發明。The invention will be described in detail below with reference to the accompanying drawings.
圖4及5為根據本發明之較佳具體實施例的平面板顯示器用之驅動器的電路圖。4 and 5 are circuit diagrams of a driver for a flat panel display in accordance with a preferred embodiment of the present invention.
參考圖4及5,平面板顯示器用之驅動器藉由在複數個通道處映射參考電流以驅動平面板顯示器。驅動器包括參考電流來源12、驅動區塊選擇器14、參考電流驅動區塊30及複數個通道50。Referring to Figures 4 and 5, a flat panel display driver drives a flat panel display by mapping a reference current at a plurality of channels. The driver includes a reference current source 12, a drive block selector 14, a reference current drive block 30, and a plurality of channels 50.
驅動區塊選擇器14選擇依據輸入參考電流啟動的參考電流驅動區塊。參考電流驅動區塊30包括採用低電壓MOS電晶體配置的第一電流鏡。第一電流鏡映射透過參考電流輸入級輸入的參考電流。該等複數個通道50包括採用高電壓MOS電晶體配置的第二電流鏡。第二電流鏡映射透過選定參考電流驅動區塊輸入的映射電流並將其作為輸出信號輸出。The drive block selector 14 selects a reference current drive block that is activated in accordance with the input reference current. The reference current drive block 30 includes a first current mirror in a low voltage MOS transistor configuration. The first current mirror maps the reference current input through the reference current input stage. The plurality of channels 50 include a second current mirror configured in a high voltage MOS transistor. The second current mirror maps the mapped current input through the selected reference current drive block and outputs it as an output signal.
儘管驅動器包括與面板的個別片段線一對一對應的複數個通道,本發明可採用共同連接至所有片段線的一個通道加以實施。此情形中,較佳的係另外包括片段線選擇器,其用於選擇片段線,以發送通道輸出。片段線選擇器可使用已知技術加以實施。例如,片段線選擇器可採用開關加以實施,開關可切換通道輸出及片段線。Although the driver includes a plurality of channels that correspond one-to-one with the individual segment lines of the panel, the present invention can be implemented with a channel that is commonly connected to all of the segment lines. In this case, it is preferred to additionally include a segment line selector for selecting the segment line to transmit the channel output. The segment line selector can be implemented using known techniques. For example, the segment line selector can be implemented with a switch that switches the channel output and the segment line.
本發明可應用於驅動器,其用於使用OLED驅動平面板顯示器。The invention is applicable to a driver for driving a flat panel display using an OLED.
圖4內顯示驅動器的整個結構,圖5顯示一個參考電流驅動區塊及一個通道。顯示一個參考電流驅動區塊及一個通道的部分與圖3內所示的先前技術相同。Figure 4 shows the entire structure of the driver. Figure 5 shows a reference current drive block and a channel. The portion showing a reference current drive block and a channel is the same as the prior art shown in FIG.
參考電流來源12產生對應於輸入像素資料之亮度強度的電流。由於輸入像素資料為數位資料,且參考電流來源之輸出為類比信號,必須提供數位類比轉換器(DAC)。不過,由於數位類比轉換係熟習技術,其說明省略。The reference current source 12 produces a current corresponding to the intensity of the luminance of the input pixel data. Since the input pixel data is digital and the output of the reference current source is an analog signal, a digital analog converter (DAC) must be provided. However, since the digital analog conversion is familiar with the technique, the description is omitted.
一項具體實施例中,一個參考電流驅動區塊30包括採用一對低電壓NMOS電晶體配置的第一電流鏡。第一電流鏡採用第一NMOS電晶體Mn31及第二NMOS電晶體Mn32加以配置,第一NMOS電晶體Mn31具有接收參考電流之汲極、與汲極連接的閘極以及接地之源極,第二NMOS電晶體Mn32具有與第一NMOS電晶體Mn31之閘極連接的閘極、接地之源極及輸出映射電流Im1之汲極。In one embodiment, a reference current drive block 30 includes a first current mirror configured using a pair of low voltage NMOS transistors. The first current mirror is configured by using a first NMOS transistor Mn31 and a second NMOS transistor Mn32. The first NMOS transistor Mn31 has a drain for receiving a reference current, a gate connected to the drain, and a source of the ground, and a second The NMOS transistor Mn32 has a gate connected to the gate of the first NMOS transistor Mn31, a source of the ground, and a drain of the output mapping current Im1.
一項具體實施例中,一個通道50包括採用一對高電壓PMOS電晶體配置的第二電流鏡。第二電流鏡採用第一PMOS電晶體Mph51及第二PMOS電晶體Mph52加以配置。第一PMOS電晶體Mph51具有與高電壓連接的源極、與汲極連接的閘極及接收映射電流Im1的汲極。第二PMOS電晶體Mph52具有與高電壓連接的源極、與第一PMOS電晶體Mph51之閘極連接的閘極及輸出輸出電流的汲極。In one embodiment, a channel 50 includes a second current mirror configured with a pair of high voltage PMOS transistors. The second current mirror is configured by a first PMOS transistor Mph51 and a second PMOS transistor Mph52. The first PMOS transistor Mph51 has a source connected to a high voltage, a gate connected to the drain, and a drain receiving the mapping current Im1. The second PMOS transistor Mph52 has a source connected to a high voltage, a gate connected to the gate of the first PMOS transistor Mph51, and a drain outputting an output current.
此處,低電壓裝置為設計成僅在較低電壓(例如2.5-3V)環境下驅動的MOS電晶體,高電壓裝置為設計成在較低電壓環境和較高電壓(例如大約18V)環境下驅動的MOS電晶體。藉由在製造MOS電晶體時控制通道寬度對通道長度的比率,電晶體具有低電壓特徵及高電壓特徵。Here, the low voltage device is a MOS transistor designed to be driven only in a lower voltage (for example, 2.5-3V) environment, and the high voltage device is designed to be in a lower voltage environment and a higher voltage (for example, about 18V) environment. Drive MOS transistor. The transistor has a low voltage characteristic and a high voltage characteristic by controlling the ratio of the channel width to the channel length when fabricating the MOS transistor.
儘管高電壓裝置優點在於操作範圍較廣泛,並且可向輸出端子供應較大功率數量,缺點在於其在半導體基板上佔據較大面積,且會導致較多的製程錯誤。Although the high voltage device has an advantage in that the operating range is wide and a large amount of power can be supplied to the output terminal, it is disadvantageous in that it occupies a large area on the semiconductor substrate and causes a large number of process errors.
用於驅動有機EL面板的驅動器接收數位影像及控制信號,並啟動掃描線,接著產生與片段線之像素資料一一對應的輸出電流。驅動器包括用於根據像素資料驅動參考電流的結構,以及用於驅動與片段線一對一對應之輸出電流的結構。The driver for driving the organic EL panel receives the digital image and the control signal, and activates the scan line, and then generates an output current corresponding to the pixel data of the segment line. The driver includes a structure for driving a reference current based on the pixel data, and a structure for driving an output current corresponding to the one-to-one correspondence with the segment line.
通常,用於驅動參考電流之元件的參考基板區域100置放在半導體基板中心。用於將輸出電流驅動至片段線的元件置放在鄰近參考基板區域100的通道基板區域500。一項具體實施例中,參考電流驅動區塊30及參考電流選擇器14形成於參考基板區域100上,通道50形成於通道基板區域500上。Typically, the reference substrate region 100 of the component for driving the reference current is placed at the center of the semiconductor substrate. An element for driving the output current to the segment line is placed in the channel substrate region 500 adjacent to the reference substrate region 100. In one embodiment, reference current drive block 30 and reference current selector 14 are formed on reference substrate region 100, and channel 50 is formed on channel substrate region 500.
用於產生供應至通道之參考電流的參考電流驅動區塊30可採用低電壓裝置加以配置。低電壓裝置佔據的面積比高電壓裝置小。因此,藉由在以先前技術放置高電壓裝置的參考基板區域100上形成複數個參考電流驅動區塊可延伸操作範圍。The reference current drive block 30 for generating a reference current supplied to the channel can be configured with a low voltage device. The low voltage device occupies less area than the high voltage device. Thus, the operational range can be extended by forming a plurality of reference current drive blocks on the reference substrate region 100 in which the high voltage device is placed in the prior art.
僅必須驅動多級參考電流驅動區塊30之一。藉由依據從參考電流來源供應的電流使驅動區塊選擇器14選擇一個參考電流驅動區塊,此情況可變為可能。Only one of the multi-level reference current drive blocks 30 must be driven. This can be made possible by the drive block selector 14 selecting a reference current drive block based on the current supplied from the reference current source.
用於個人電腦(PC)內之影像資料為數位資料,驅動器對影像資料執行數位類比轉換,從而將其轉換為參考電流值。相應地,儘管驅動區塊選擇器14可實施成決定參考電流並開啟對應參考電流驅動區塊,較佳的係藉由使用數位像素資料值(其係關於驅動器晶片的輸入資料)選擇參考電流驅動區塊。藉由將數位像素資料值範圍分組為一預定數量並在輸入該分組範圍的數位值時將開啟信號發射至指定驅動區塊選擇器,實現參考電流驅動區塊的選擇。輸入數位值之範圍比輸出數位值更廣泛。輸入數位值分組為預定數量(輸出值範圍),並將一個輸出值指定給一個群組。由於此程序可採用已知技術加以實施,例如使用多工器(MUX),其說明省略。The image data used in a personal computer (PC) is digital data, and the driver performs digital analog conversion on the image data to convert it into a reference current value. Accordingly, although the drive block selector 14 can be implemented to determine the reference current and turn on the corresponding reference current drive block, it is preferred to select the reference current drive by using the digital pixel data value (which is related to the input data of the driver chip). Block. The selection of the reference current drive block is achieved by grouping the range of digital pixel data values into a predetermined number and transmitting an enable signal to the designated drive block selector upon input of the digital value of the packet range. The range of input digit values is wider than the output digit value. The input digit values are grouped into a predetermined number (output value range) and one output value is assigned to a group. Since this procedure can be implemented using known techniques, such as the use of a multiplexer (MUX), the description is omitted.
一項具體實施例中,可進一步包括用於選擇要啟動的通道之通道開關部分。通道開關部分選擇要在共享啟動掃描線之片段線中驅動的片段。通道開關部分包括MOS電晶體Mnh51,其具有接收開/關控制信號之閘極、與第二電流鏡之第一及第二PMOS電晶體之汲極連接的汲極、與第一電流鏡之輸入端子連接的源極。此處,較佳的係採用高電壓裝置配置MOS電晶體Mnh51。In a specific embodiment, a channel switch portion for selecting a channel to be activated may be further included. The channel switch section selects a segment to be driven in the segment line of the shared startup scan line. The channel switch portion includes a MOS transistor Mnh51 having a gate receiving the on/off control signal, a drain connected to the drains of the first and second PMOS transistors of the second current mirror, and an input of the first current mirror The source of the terminal connection. Here, it is preferable to configure the MOS transistor Mnh51 using a high voltage device.
下文中,將參考圖4及5說明平面板顯示器用之驅動器的操作。Hereinafter, the operation of the driver for the flat panel display will be described with reference to FIGS. 4 and 5.
另外包括通道開關部分的情形對應於選擇通道從而開啟開關的情形,因此與無通道開關部分之情形相同。The case where the channel switch portion is additionally included corresponds to the case where the channel is selected to turn on the switch, and thus is the same as the case of the channelless switch portion.
將數位影像資料輸入驅動器。接著,驅動器決定脈衝寬度,以依據光度及層次及/或輸出至片段線之電流大小驅動掃描線。在決定電流大小(參考電流值)的程序中,驅動區塊選擇器14選擇適用於驅動操作之參考電流驅動區塊。Input digital image data into the drive. Next, the driver determines the pulse width to drive the scan line based on the luminosity and level and/or the magnitude of the current output to the segment line. In the program for determining the current magnitude (reference current value), the drive block selector 14 selects a reference current drive block suitable for the drive operation.
若啟動掃描線,參考電流從驅動器的參考電流來源12得以產生。將參考電流輸入選定參考電流驅動區塊30。If the scan line is activated, the reference current is generated from the reference current source 12 of the driver. The reference current is input to the selected reference current drive block 30.
若參考電流從電源供應電壓VDD流至選定參考電流驅動區塊30內的接地電壓,第一電流鏡之第一及第二NMOS電晶體Mn31及Mn32開啟,並透過第二NMOS電晶體Mn32產生藉由映射參考電流生成的第一映射電流Im1。If the reference current flows from the power supply voltage VDD to the ground voltage in the selected reference current driving block 30, the first and second NMOS transistors Mn31 and Mn32 of the first current mirror are turned on, and are generated by the second NMOS transistor Mn32. The first mapping current Im1 generated by the mapping reference current.
提供通道開關Mnh51,以便僅啟動對應於顯示像素之位置的通道。若第一映射電流Im1流過通道開關Mnh51所選擇的通道50之通道輸入PMOS電晶體Mph51,片段驅動PMOS電晶體Mph52也開啟,並產生第二映射電流Im2。如上所述,第二映射電流Im2為平面板顯示器之驅動器之輸出信號,利用OLED將其作為電流供應至平面板顯示器之片段線。A channel switch Mnh51 is provided to activate only the channel corresponding to the position of the display pixel. If the first mapping current Im1 flows through the channel input PMOS transistor Mph51 of the channel 50 selected by the channel switch Mnh51, the segment driving PMOS transistor Mph52 is also turned on, and a second mapping current Im2 is generated. As described above, the second mapping current Im2 is the output signal of the driver of the flat panel display, which is supplied as a current to the segment line of the flat panel display by the OLED.
儘管採用兩個NMOS電晶體配置參考電流區域,可進一步包括其他元件。Although the reference current region is configured with two NMOS transistors, other components may be further included.
同樣,儘管已說明對應電流輸入/輸出係從參考電流來源至參考電流驅動區塊、從參考電流驅動區塊至通道以及從通道至片段線,電流輸入可為接收器,電流輸出可為來源,反之亦然。Similarly, although the corresponding current input/output system has been illustrated as being from the reference current source to the reference current drive block, from the reference current drive block to the channel, and from the channel to the segment line, the current input can be the receiver and the current output can be the source. vice versa.
根據本發明,平面板顯示器用之驅動器可將充足電源供應至對應片段線,亦可藉由採用與相鄰電晶體具有相同規格的電晶體實施通道驅動電流鏡來防止鏡面電晶體失配。In accordance with the present invention, a driver for a flat panel display can supply sufficient power to a corresponding segment line, or a mirror transistor current misalignment can be prevented by implementing a channel drive current mirror using a transistor having the same specifications as an adjacent transistor.
本申請案包含與韓國專利申請案第2004-31392號相關的標的,其在2004年5月4日於韓國專利辦事處申請,其全部內容以提及方式併入本文中。The present application contains the subject matter related to Korean Patent Application No. 2004-31392, filed on May 4, 2004, in the Korean Patent Office, the entire contents of which is incorporated herein by reference.
儘管本發明係根據特定具體實施例作說明,但熟悉此項技術者應很清楚,在不背離如下申請專利範圍所定義之本發明的精神與範疇的情況下,可作不同的變化及修改。While the invention has been described with respect to the specific embodiments of the present invention, it is understood that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the following claims.
12‧‧‧參考電流來源12‧‧‧Reference current source
14‧‧‧驅動區塊選擇器14‧‧‧Drive block selector
30‧‧‧參考電流驅動區塊30‧‧‧Reference current drive block
50‧‧‧複數個通道50‧‧‧Multiple channels
100‧‧‧參考基板區域100‧‧‧Reference substrate area
110‧‧‧參考電流區塊110‧‧‧Reference current block
112‧‧‧參考電流來源112‧‧‧Reference current source
130‧‧‧第一電流鏡130‧‧‧First current mirror
150‧‧‧複數個通道150‧‧‧Multiple channels
151‧‧‧第二電流鏡151‧‧‧second current mirror
500‧‧‧通道基板區域500‧‧‧channel substrate area
Mn11‧‧‧輸出電晶體Mn11‧‧‧ output transistor
Mn31‧‧‧第一NMOS電晶體Mn31‧‧‧First NMOS transistor
Mn32‧‧‧第二NMOS電晶體Mn32‧‧‧second NMOS transistor
Mph151‧‧‧高電壓電晶體Mph151‧‧‧High Voltage Transistor
Mph152‧‧‧高電壓電晶體Mph152‧‧‧High voltage transistor
Mnh51‧‧‧MOS電晶體/通道開關Mnh51‧‧‧MOS transistor/channel switch
Mph51‧‧‧第一PMOS電晶體Mph51‧‧‧First PMOS transistor
Mph52‧‧‧第二PMOS電晶體Mph52‧‧‧Second PMOS transistor
Mref11‧‧‧參考電晶體Mref11‧‧‧ reference transistor
藉由以上實施方式並參考附圖將會明白本發明之上述及其他目的與特徵,其中:圖1為使用一普通有機電致發光(EL)的平面板顯示器之方塊圖;圖2為傳統電流鏡的電路圖,其中將電流供應至圖1所示的一個片段線;圖3為另一傳統電流鏡的電路圖,其中將電流供應至圖1所示的一個片段線;圖4為傳統電流鏡的電路圖,其中將電流供應至圖1所示的所有片段線;以及圖5為根據本發明之較佳具體實施例的電流鏡之電路圖,其中將電流供應至圖1所示的一個片段線。The above and other objects and features of the present invention will become apparent from the embodiments of the invention, wherein <RTIgt; <RTIgt; </RTI> Figure 1 is a block diagram of a flat panel display using a conventional organic electroluminescence (EL); a circuit diagram of a mirror in which a current is supplied to a segment line shown in FIG. 1; FIG. 3 is a circuit diagram of another conventional current mirror in which a current is supplied to a segment line shown in FIG. 1; FIG. 4 is a conventional current mirror A circuit diagram in which current is supplied to all of the segment lines shown in FIG. 1; and FIG. 5 is a circuit diagram of a current mirror in accordance with a preferred embodiment of the present invention, in which current is supplied to a segment line shown in FIG.
12‧‧‧參考電流來源12‧‧‧Reference current source
14‧‧‧驅動區塊選擇器14‧‧‧Drive block selector
30‧‧‧參考電流驅動區塊30‧‧‧Reference current drive block
50‧‧‧複數個通道50‧‧‧Multiple channels
100‧‧‧參考基板區域100‧‧‧Reference substrate area
500‧‧‧通道基板區域500‧‧‧channel substrate area
Mn31‧‧‧第一NMOS電晶體Mn31‧‧‧First NMOS transistor
Mn32‧‧‧第二NMOS電晶體Mn32‧‧‧second NMOS transistor
Mph51‧‧‧第一PMOS電晶體Mph51‧‧‧First PMOS transistor
Mph52‧‧‧第二PMOS電晶體Mph52‧‧‧Second PMOS transistor
Mnh51‧‧‧MOS電晶體/通道開關Mnh51‧‧‧MOS transistor/channel switch
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- 2004-05-04 KR KR1020040031392A patent/KR100619412B1/en active IP Right Grant
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- 2005-03-03 US US11/072,205 patent/US8022906B2/en active Active
- 2005-03-10 JP JP2005067224A patent/JP4958402B2/en active Active
- 2005-03-11 TW TW094107597A patent/TWI404000B/en active
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TW583628B (en) * | 2001-08-29 | 2004-04-11 | Seiko Epson Corp | Current generating circuit, semiconductor integrated circuit, electro-optical device, and electronic apparatus |
TW200403612A (en) * | 2002-03-13 | 2004-03-01 | Koninkl Philips Electronics Nv | Electroluminescent display device |
US20030234754A1 (en) * | 2002-06-20 | 2003-12-25 | Shinichi Abe | Drive circuit of active matrix type organic EL panel and organic EL display device using the same drive circuit |
Also Published As
Publication number | Publication date |
---|---|
JP2005321759A (en) | 2005-11-17 |
KR20050106225A (en) | 2005-11-09 |
US20050248328A1 (en) | 2005-11-10 |
JP4958402B2 (en) | 2012-06-20 |
KR100619412B1 (en) | 2006-09-08 |
TW200601216A (en) | 2006-01-01 |
US8022906B2 (en) | 2011-09-20 |
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